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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2935af91c3937d428be63cdc0d5c243edcd018432b3ec528264778b1a7029c1' 
  AND token = 'FpCNoJdjpZWKcVhHpeUuU4KxqU8Zpt8mMS0G+OyPiqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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