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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ba1e12c6217a39d45ea2be38792f851137d72269fc79e9753363b49d938acb' 
  AND token = 'DPbyf9j13BrUbJr/tzfTwehKuLecl2Acg9+NFm2Us8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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