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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9942f59ed2d6a2b096b99ba7add61d775cd0b984389760c5546a5fd8de6d851' 
  AND token = '14rSP58QC9WnAGGwPqqm1f1p4EBidfeqhUAUPAqGSPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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