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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9740c9a76c04382805c67f16b789697f8116b7e7909f5b2b1d41fe962b7b9eff' 
  AND token = 'w86hZ9PIG2Y5DGslEa0uOJDzc19uIaA3W3fDbmVcHao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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