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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca79a5f3ff8ade306a0e6dbd9462f22c9490e55e99fa9ef0af94fcfc3d68f29' 
  AND token = 'F9QirFw/M0mXjtij9htkt7ihkFbq18Nqfxc1rZnB6Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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