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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0d399113813f14f0d2638773348d754c44d202462b2d9678146c868e76c337' 
  AND token = 'u1ZZ6PNJxvxNvLsLMXV8aqEAPk9jSUyCa2lBfl4B+po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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