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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9c98bbd8ae0e229bee825969e5f902983fd0b70d0340b46d741579169e80ef' 
  AND token = 'ubcveSZCaeNaOoqOg6PLMqJ/L/YuzB10G5E81464krA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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