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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed42aaf3fcf46cd5b1aaf6ccc89f2f90bb6531be36ff5f89fcd9d06bce81f05' 
  AND token = 'XgeCT8HnL9cZpQlUsnW+5aUR5Uha+gEmGLiv0mDPOuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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