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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3688f0b3cc756b108d4010760c723cb6c854282723e6af06866a906038637df' 
  AND token = 'ZMi+JF5EZS25SEkBFwNYRXiqvg/5XUq4/Yfx6XSkgfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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