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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2116b68ba0e9a5b7f942f0b1c0d365950ec0f771afe86a124b1383ac43cf5a0f' 
  AND token = 'KD4+fUIqAacVlKA+xlOIGycl/JOWHV5WE8+nsIPfVQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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