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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cede1206c698107e72b1e67bb66e2d13385cf8b7fb4fcc1a3ca79f1caac6a089' 
  AND token = '08nNcAezdVjLe0kT3kPCG3bHMIZFeIYBjFt+q3BSXDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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