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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2521f5d74bdc3dbd0c9d9d3470dd1ac2bb1acb1b6c52fde20a3ba949f74984' 
  AND token = 'VySwvzmNiN5X2rgyobllUterWb/1XqX3cOAAx7Z04Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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