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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55c44f90a527787c2101399c94f37c789f0e2b938a2e16b922429b471e70ab5' 
  AND token = 'V9rkoP+3WufHxBUpRFxPNb31QB+YqtVCdrujj068G4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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