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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f925597f6995a0f745f2f2e088fba5e0b79e26c89d2369a1c3d5ee76c0ffacf7' 
  AND token = '6apoTqQFzp0i3toeCkXWGfbL7BBMtCKKQFMkkW04M68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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