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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b5f7d77aa407523f4e8b97621d94a64db5bbf8de8356980081e3bbc3700eee' 
  AND token = '0+b6fB6rKogIeltZwXkN4oEb1Dg2sFEq3z3rbQNXc1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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