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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6157516319549b10631e519e1809e1b28434090fc30c859fd463e6787fea72' 
  AND token = '/9yGS1554qrANTLM2bDe8CEWQ7VcO4yrPsOoIvwv9Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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