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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba102f19e5f784b9f6b5cb55c99168b5ec2151e04159aedd96a7b332c5e83b6' 
  AND token = 'Tc3LitP+boJBGvrcC7+793/5XDu2wDMEZQICy+06408=' 
  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"
    }
  }
}