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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4768b8905b5325a014539b1ae975a37bd2acec6d2ab8afeb9046b5d3b766d3a1' 
  AND token = 'OWlcy2KmDlDx4poYS1ivwAMSwPvf+JMS9diVh+0gEok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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