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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08924e770f81687aa9000ec4b33b3d92edaec6ebf46e27bac75aad965a11c2c1' 
  AND token = 'ZzKlfuuUPOWE8Oj/esclfqK6x7z7Ld2UaRFKRXz0YCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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