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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73195c10047c2591e4981a86d22498ec9f823f1bf1059af648c12ea70c2ab13a' 
  AND token = 't7zpIv5zoXfBG9mV3i+GRmB7/eb39LMwp6zr7odDzF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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