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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e669ecc8a53363cd15a6c789b0c5a6fcbc4c1b265d4fc63f05d0a23b82d17d3' 
  AND token = '5+2Gr85+oV0gdN//D0+klMAilrBuyL0fE8f3/mB+U80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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