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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a285ca0d943431b0085e5a9d4e7c987348a39d126528a4e2d871f05e27ef789d' 
  AND token = 'jYtbToed2TDvNlIP8fVUmZjbW1gyQpZEXgKxQL9EH6I=' 
  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"
    }
  }
}