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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea791371d75ef9782de57ab56b5342acd1f5198cf5f380e4d3e357b8d58cc49c' 
  AND token = 'Vz8/YE4hzBtC7hF8YmO0tDTEa8LFV/uBX3NqZ3awROA=' 
  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"
    }
  }
}