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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8ec789c25158ffef87b650c0f90b42d79752d05f8b99d60a7ac9feaa1f40366' 
  AND token = 'q04nsSzxUZIFA+Z/+Lz90PWo9m1CrC+Ov3fVw90W/og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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