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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0eb1fe37547bd3f614f7e9c1a05be51652cd1a2eb33537714e7db1041e3a7c3' 
  AND token = 'K4rJHwNfU93gL4F1P7o+dzaq9Q1JRpzUsBxtEMObI7M=' 
  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"
    }
  }
}