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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c01a113d1a23c9ae3fe1d1be6f3ab9d17714d39cbf19f9d33cc226d6c09e7f' 
  AND token = 'mx+h1Q/bRRRiyZTNhVrn8csg2B6TD7vW0T/myNQYFUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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