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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed492b6b7e7350882d16cf5d6c87b170be37222c4c7ad8cba4c0f6006d11204d' 
  AND token = 'IQFonCrlQgv0fZGDvbREtm5/ttUjFykP1y0yLAgO0BQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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