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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4469321c81e17d3357a05e477aa483ded9a8b776f5d91022c59209e2c3b1c115' 
  AND token = 'KAKkz7zuO4e6eAaAI1VN43QZaL3y9JpLIk4vGMRtrjE=' 
  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"
    }
  }
}