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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef64db294d36e571ba915d8c2995b946f1cd94196399fc9c3d69990c8b7190d5' 
  AND token = 'lUwgGfgE80ui/JU/8VyRlkL3g4O8WYFOSBs5M+x7pH4=' 
  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"
    }
  }
}