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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e73c7ae0e0ea67fed891377c4319799c1c71275fb689fbe887a5b2756389b1' 
  AND token = 'U012a1U5ZStXyOC1LyvWN+XTmPa+lYY6vdwnQoDIz+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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