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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac6cbefb30e1bda1f97eea47890f9984d758337161f91ca9643608be5ba713e' 
  AND token = 'BRG3LOBQO4bEUg2s+xmmEd9q0f823ClksW/Uwin9rMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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