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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e505890bf449ae88e31cf4fea9b7445492bb3cc745e558cbc45e4eb41725f1d7' 
  AND token = 'CpqoAZP4lM3W1cxyR69StZw9XmTMco92FSip9/BF4jE=' 
  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"
    }
  }
}