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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83505b2fa40a638196e09900973a00b32145c0631fbf1a58a54d6201de62c1e2' 
  AND token = 'Y6e8JcnhyzM+2fxGP3PllxQonG177K7L28X+pV4x5Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}