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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2cbf1c0f088c5f98034a6eedbb974deaa7781033d373fb7448f0d142478f87' 
  AND token = 'nbo191n+sRK3piAIZ+R2zvHJ91A3EoNy4FZt8xQbU20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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