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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1bb89d622cf2d42b51beb15e0e0a64e2f9ae2c2a343e5204e8c7e3fc525798' 
  AND token = 'mYGdOhv5mQG+Pw8fMvrss1vrsn3WNVhiz/hVMMy00AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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