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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5231ccccff7e3a3bb67b3140755dcdc3b34164e8e117ec695b8abe58dfc8c0a2' 
  AND token = 'x2o8nOHcoNfjGWAFDXGC/faywjQqNKMllupT2J2sORw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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