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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e377f97736c12deae2cf196edf280ad58fa8d852e7559e35e338dadaa9a88053' 
  AND token = 'y0h6OQk+6zVcXS5IVtAoydBb6MQUyMm/KT8IL4FSX24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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