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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8b6d08c23e6e4f355f2753a49267df8f2f5ea272cf5c548401b6b83e0620c8' 
  AND token = 'ml219GFzra7zY2/v1aREYRiJImEu+LF6WhlHGXK5Ny0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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