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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192dd194f9f4c67fcf6658bef53c4192e31408e6667a43347a31659217893ea7' 
  AND token = 'X/5bdMff5J40EIJUTnOtxqlXNXzjKazZC20OZTTjLyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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