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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c640053061f868525fa28332d26a5ca92529005b4e0a3662d94b80e8d28b6d0e' 
  AND token = '61fABl75NznJSwXH+1HxQ7Ad/e/TQZB8cuhEXQvvDK8=' 
  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"
    }
  }
}